Games like Rooftop Postgirl
Games like Rooftop Postgirl include Undertale, Finding Paradise, To the Moon, DELTARUNE, and Impostor Factory. We matched them by the tags players give Rooftop Postgirl on Steam (Comedy, Supernatural, Emotional, Multiple Endings, and Story Rich): closest matches first, and among equally close ones the better-known games.

Undertale
Shared: Story Rich · Multiple Endings · Comedy

Finding Paradise
Shared: Emotional · Story Rich · Pixel Graphics

To the Moon
Shared: Story Rich · Emotional · Interactive Fiction

DELTARUNE
Shared: Story Rich · Emotional · Comedy

Impostor Factory
Shared: Emotional · Story Rich · Pixel Graphics

SANABI
Shared: Story Rich · Pixel Graphics · 2D Platformer

Life is Strange Remastered
Shared: Story Rich · Multiple Endings · Emotional

Detroit: Become Human
Shared: Multiple Endings · Story Rich · Emotional

Celeste
Shared: Pixel Graphics · Female Protagonist · Story Rich

Until Then
Shared: Emotional · Story Rich · Interactive Fiction

Life is Strange: True Colors
Shared: Story Rich · Multiple Endings · Female Protagonist

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Emotional · Story Rich · Female Protagonist

Life is Strange: Before the Storm Remastered
Shared: Multiple Endings · Story Rich · Female Protagonist

Reventure
Shared: Comedy · Multiple Endings · Pixel Graphics

Refind Self: The Personality Test Game
Shared: Interactive Fiction · Female Protagonist · Story Rich

There Is No Game: Wrong Dimension
Shared: Comedy · Story Rich · Pixel Graphics

Katana ZERO
Shared: Story Rich · Pixel Graphics · Action

OMORI
Shared: Story Rich · Multiple Endings · Pixel Graphics

Before Your Eyes
Shared: Emotional · Story Rich · Interactive Fiction

月华辉映之刻
Shared: Female Protagonist · Multiple Endings · Interactive Fiction

Oxenfree
Shared: Supernatural · Story Rich · Female Protagonist

No Case Should Remain Unsolved
Shared: Interactive Fiction · Story Rich · Female Protagonist

Pizza Tower
Shared: Comedy · 2D Platformer · Pixel Graphics

OneShot
Shared: Story Rich · Pixel Graphics · Multiple Endings